Reports whether the control is valid. A control is considered valid if no validation errors exist with the current value. If the control is not present, null is returned.

invalid: boolean | null

只读

Reports whether the control is invalid, meaning that an error exists in the input value. If the control is not present, null is returned.

pending: boolean | null

只读

Reports whether a control is pending, meaning that that async validation is occurring and errors are not yet available for the input value. If the control is not present, null is returned.

disabled: boolean | null

只读

Reports whether the control is disabled, meaning that the control is disabled in the UI and is exempt from validation checks and excluded from aggregate values of ancestor controls. If the control is not present, null is returned.

enabled: boolean | null

只读

Reports whether the control is enabled, meaning that the control is included in ancestor calculations of validity or value. If the control is not present, null is returned.

Reports the control's validation errors. If the control is not present, null is returned.

pristine: boolean | null

只读

Reports whether the control is pristine, meaning that the user has not yet changed the value in the UI. If the control is not present, null is returned.

dirty: boolean | null

只读

Reports whether the control is dirty, meaning that the user has changed the value in the UI. If the control is not present, null is returned.

touched: boolean | null

只读

Reports whether the control is touched, meaning that the user has triggered a blur event on it. If the control is not present, null is returned.

status: string | null

只读

Reports the validation status of the control. Possible values include: 'VALID', 'INVALID', 'DISABLED', and 'PENDING'. If the control is not present, null is returned.

untouched: boolean | null

只读

Reports whether the control is untouched, meaning that the user has not yet triggered a blur event on it. If the control is not present, null is returned.

statusChanges: Observable<any> | null

只读

Returns a multicasting observable that emits a validation status whenever it is calculated for the control. If the control is not present, null is returned.

valueChanges: Observable<any> | null

只读

Returns a multicasting observable of value changes for the control that emits every time the value of the control changes in the UI or programmatically. If the control is not present, null is returned.

path: string[] | null

只读

Returns an array that represents the path from the top-level form to this control. Each index is the string name of the control on that level.